To get correct size measure around dogs neck. Pick the correct size from the drop down box. We will make it with room to adjust both ways. These are a heavy Duty Dog collars, to fit your dog. Made with heavy nylon and METAL side release buckles. I am a strong believer that for any dog over 20 lbs a plastic buckle is nothing but a cruel joke. Not so funny however when it tears up in a few weeks. If you are unhappy for any reason we will give you a refund. I supply all the local hunters and they love these strong collars.